I also dislike Steam. I bought Universe Sandbox² through teachersgaming.com, as was recommended to me by Giant Army (the makers of Universe Sandbox²). This helps you purchase it without Steam, but if you already bought it, you shouldn't have to buy it again.

Lox, no problem, we can get you set up again with Universe Sandbox Legacy (Universe Sandbox ² is the latest version which was released in 2013). Please send me a message with any details you have from your original order or the product key.

I would like to be able to download the standalone version of Universe Sandbox 2 for free from universesandbox.com official website. For that, you should upload an older version which, of course is not too old. Lets say, its predecessor - Universe Sandbox 2 - Update 20.